"In my opinion" a pulverised coal burner to make steam and
then electricity for a single wire caternary system as is done in Norway
would work well.
The electric pantograph method of power deliver used for the
IORE locomotives used in pairs used for iron ore delivery from the LKAB iron mines
(The IORE locomotives are the Bombardier TRAXX models).
to the ports and returning to the mines with the clay loads to make
the iron ore pellets are a beautiful thing to see..